1111 6.1 Barometric (Atmospheric) Pressure Standard Atmospheric Pressure is measured by a mercury Barometer The pressure exerted by the column of mercury … … must be the same as that exerted by the atmosphere. One atmosphere ( atm ) is the pressure exerted by a column of mercury exactly 760 mm high (0°C, g = 9.80665 m s–2)

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1313 6.1 Manometers Manometers are used to measure differences in pressure, or the pressure of a sample of gas Pressure is measured using the difference in the heights of mercury (or other liquid) in the two arms of the manometer

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